.icon-sprites { display:inline-block; background-image: url(../assets/images/sprite.png);background-size: 202px;}
.icon-sprites-icon_backtop { width: 42px; height: 64px; background-position: -160px 0px; }
.icon-sprites-icon_chanpin { width: 40px; height: 40px; background-position: -160px -64px; }
.icon-sprites-icon_duijie { width: 160px; height: 160px; background-position: 0px 0px; }